<template>
    <div class="list" ref="wrapper">
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">{{ this.currentCity}}</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" 
                    v-for="item of hot" 
                    :key="item.id"
                    @click="handleCityClick(item.name)">
                        <div class="button">{{ item.name }}</div>
                    </div>
                </div>
            </div>
            <div class="area" 
            v-for="(item,key) of cities" 
            :key="key"
            :ref="key">
                <div class="title border-topbottom">{{ key }}</div>
                <div class="item-list">
                    <div 
                        class="item border-bottom"
                        v-for="innerItem of item"
                        :key="innerItem.id"
                        @click="handleCityClick(innerItem.name)"
                        >{{ innerItem.name }}
                    </div>
                </div>
            </div>
        </div>
    </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState,mapMutations } from 'vuex'
export default {
    name: 'CityList',
    props:{
        hot:Array,
        cities:Object,
        letter:String
    },
    computed: {
        ...mapState({
            currentCity:'city'
        })
    },
    methods: {
        handleCityClick (city) {
            this.changeCity(city)
            this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    },
    mounted () {
        this.scroll = new Bscroll(this.$refs.wrapper)
    },
    watch: {
        letter(){
            if(this.letter) {
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    }
}
</script>

<style lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .bottom-topbottom
      &:before
        border-color #ccc
      &:after
        border-color #ccc
    .border-bottom
      &:before
        border-color #ccc
  .list
    position absolute
    overflow hidden
    top 1.58rem
    left 0
    right 0
    bottom 0
    .title
      line-height .54rem
      background #eee
      padding-left .2rem
      color #666
      font-size .26rem
    .button-list
      overflow hidden
      padding .1rem .6rem .1rem .1rem
      .button-wrapper
        float left
        width 33.33%
        .button
          margin .1rem
          padding .1rem 0
          text-align center
          border .02rem solid #ccc
          border-radius .06rem
    .item-list
      .item
        line-height .76rem
        padding-left .2rem


</style>
